NewResolver returns a new instance of the Resolver.

Cfg stores the configuration parameters for all the NGINX Plus instances to get the data from.

NginxHost stores the information about a remote host of an NGINX Plus instance.

NginxPlus stores the NGINX Plus API client and some internal configuration to fetch data from NGINX.

Resolver handles the resolution of NGINX Plus IPs using a custom DNS resolver.

Task is a wrapper to store results of fetching multiple NGINX Plus instances.